Developing tank for 35 mm. film



Fel; 8, 1949. J. P. MANCUSO DEVELOPING TANK FOR 55 MM. FILM Filed July 27, 1946 2 Sheets-Sheet l Mm 4 g. i

6 I11 ucutor JOSEPH P575? Mn/vcuso J. P. MANCUSO 2,461,289

DEVELOPING TANK FOR 55 MM. FILM 2 Shets-Sheet 2 Feb. 8, 1949;

Fild July 27, 1946 w a 2 5 w 4/ f/f/t Mu m o A. M O mm M A v00000000000000Q :6 6 H I, ll, @0000 0 00000000 7 W vmv m m m m mv m ooooo W 9 P 2 2 000000000 000003 i 0 6 a N000000 000000000 Wddd y 000000\ 000000 F fi m y f a r 0 E v 0 w 0 0 0 0 0 0 0 0 $42 a #A z T 5 U H 0m 0000-\\ 00000 "W M, x loLvw M a." Q W m 7 F 000000000000000WM M000000000000000 l||l|l||| |l Illllllll ll M mwwm o o o o o 0 o 0 w a a u Patented Feb. 8, 1949 UNITED STATES PATENT OFFICE DEVELOPING TANK FOR 35 MM. FILM Joseph Peter Mancuso, Jamesburg, N. J. Application July 27, 1946, Serial No. 686,606

1 Claim.

This invention relates to improvements in developing tanks for 35 mm. film.

An object of the invention is to provide an improved developing tank for 35 mm. filmwhich may be adapted to receive and develop film having either eighteen or thirty-six exposures.

Another object of the invention is to provide an improved lightproof developing tank having means incorporated therein for supporting film having either eighteen or thirty-six exposures, together with means for agitating the developing agent when placed in the tank to reach all portions of the film equally.

A further object of the invention is to provide an improved developing tank for 35 mm. film having a lightproof cover with means for securing the same on said tank, together with a plurality of fixed film supporting clips mounted on a vertically movable tray for receiving either film having eighteen or thirty-six exposures, and de tachable clips being secured to said tray for supporting the end of the eighteen exposure film or for supporting an intermediate portion of a thirty-six exposure film.

Another object of the invention is to provide an improved developing tank for 35 mm. film having eighteen exposures or thirty-six exposures, said tank being highly efiicient in operation and relatively inexpensive to manufacture and produce.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application,

Figure 1 is a plan view of the improved film developing tank;

Figure 2 is a longitudinal sectional view taken on the line 2-2 of Figure 1;

Figure 3 is a transverse sectional view taken on the line 3-3 of Figure 2 Figure 4 is a transverse sectional view taken on the line 44 of Figure 1;

Figure 5 is a detail sectional view taken on the line 5-5 of Figure 3;

Figure 6 is a partial sectional view taken on the line 6-6 of Figure 4;

Figure 7 is a perspective view of a detachable film and supporting clip, and

Figure 8 is a perspective view of a detachable supporting clip for holding an intermediate portion of a film.

Like characters of reference are used throughout the following specification and the accompanying drawings to designate corresponding parts.

In carrying out the invention, there is provided an improved form of developing tank for 35 mm. film comprising a substantially rectangular shaped tank I which is thickened at its upper peripheral edge and formed with a light sealing groove 2 thereabout. One corner of the tank I is formed to provide the pourin spout or lip 3 on its upper edge whereby the developing agent or other liquid may be poured from the tank I after the various stages of development have been completed.

The film upporting tray 4 is substantially rectangular in shape and is of a size to be slidably received within the tank 5, and is formed with the plurality of apertures 5 through which the developing liquid may freely circulate. A plurality of supporting seats 6 will be formed on the lower surface of the tray 6 to support the same in spaced relation above the bottom of the tank l A centrally disposed upstanding tray manipulating rod 7 will be formed integrally with the tray 4 and will be knurled as at 8 on its upper end to provide a more perfect hand hold upon the same when the tray 5 is to be vertically reciprocated within the tank I during the development of a film when placed in said tank.

A cylindrical light trap or guide well 9 will be formed on the tray 4 concentrically of said rod 7, and is adapted to cooperate with and receive the depending light trap tube NJ on the tank cover H. The tank cover It is substantially rectangular in shape and is formed with a depending peripheral sealing flange [2 which will be received in the peripheral groove 2 about the upper edge of the tank I. A raised centrally disposed filling head member I3 will be formed on the cover H about the tube In and will be hollowed out as at I4 to provide a funnel through which the developing agent or liquid may be poured to pass about the rod 4 and to be received within the tank I. Spring locking clips i5 will be pivoted on the pins I6 at the opposite sides of the tank I, and will be clipped over the upstanding peripheral bead II on the top or cover Ii to hold the same tightly upon the tank I.

The tray 4 will be provided with the integrally formed spaced film supporting clips l8 arranged along the opposite sides thereof, and comprise the upstanding triangular shaped blocks having opposed depending and upstanding triangular shaped pointed supporting fingers l9 and 20 formed respectively on the upper and lower portions thereof, the same being spaced apart a distance slightly less than the width of the film 2|, so that the film will be slightly flexed by push- 3 ing inon the central portions thereof to snap the said film into the clip behind said fingers IQ and 26, thus looking the same within the clip during the time the film is being developed.

The supporting clip 22 for the end of the film will be disposed at the ends of the tray t, and

will be slotted as at 23 to receive the end of the film which will be wedged therein in an edgewise position.

The film supporting clips 2% and 25' will be formed in the same manner as the clips l8 and 22, but will he formed with the threaded attaching studs 25 and 21, respectively, so that when a film having eighteen exposures is to be developed; the clip 24'will be removed and the clip 25 will be substituted therefor and screwed into itsthreaded socket adjacent the central edge-of the tray; 4.- Of course, when a film having thirty-six exposures is to be developed, the clip 25 will hereplaoed at one end of the tray 4 and the clip 24 will be replaced'in'the central edge of said tray, as athirty-six exposure film'will be disposed back and forth crosswise of the tray and'theplips: l8"

' portion of the said rod 1 to thoroughly agitate the developing agent or liquid to reach all parts of a film equaily. After the various development stages, the developing fluids may be poured out of the spout or lip Swhile the cover isstill lockedin place upon the tank, after which the cover may be removed and the completely'developed film removed from its supportingclips and dried in anydesired manner.

From the foregoing description, it will be seen that there has been devised .andprovided a highly .45, efficient form of developing tank 01135 mm. film which will operate perfectly in developing either eighteen or thirty-six exposure films.

While the preferred embodiment of the instant invention has been illustrated and described, it will be understood that it is not intended to limit the scope of the invention thereto, as many minor changes in detail of construction may be resorted to without departure from the spirit of the invention,

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

A developing tank for 35 mm. film comprising a tank'formedwit'h a peripheral groove, a cover therefor having a sealing flange detachably seated in said groove, means for maintaining saidcover onithe-tank, a tray mounted in vertically spaced placement in the tank, a central upstanding tubular opening on said tray defining a sectional film holder, U-shaped film guides, having oppositely extending coopera'tir'igly directed retaining fingers, spacedalong the sidesof the "tray ior accommodatingfilm laced there- 'petween and film supporting clips, having'holdslots, deta-chably positioned on the trayior' selectiveuse responsive to the length of the film, light: trap collar depending telescopically from said'cover. in the tubular opening, an operating rod-extending from said tra'y through the collar eXterio-rly. of the cover for imparting vertical reciprocation to the tray. 7

JOSEPH PETER" IVIANCUSO.

REFERENCES CITED-- The following references areof record in the of this patent:

UNITED STATES PATENTS: 

